Durability of structural lightweight concrete with sintered fly ash aggregate
Authors:
- Lucyna Domagała
Abstract
The aim of this study was to present the problem of durability of structural lightweight concrete made of a sintered fly ash aggregate. The issue of durability was researched for 12 concrete series in terms of their water absorption, water permeability, and freeze-thaw resistance. Additionally, the microstructure of several concretes was analyzed with a scanning electron microscope (SEM). In the durability research, the influences of the following parameters were taken into consideration: The initial moisture content of sintered fly ash (mc = 0, 17–18, and 24–25%); the aggregate grading (4/8 and 6/12 mm); and the water-cement ratio (w/c = 0.55 and 0.37). As a result of various compositions, the concretes revealed different properties. The density ranged from 1470 to 1920 kg/m3, and the corresponding strength ranged from 25.0 to 83.5 MPa. The durability research results of tested lightweight concretes showed that, despite considerably higher water absorption, a comparable water permeability and comparable or better freeze-thaw resistance in relation to normal-weight concrete may be present. Nevertheless, the fundamental requirement of lightweight concrete to achieve good durability requires the aggregate’s initial moisture content to be limited and a sufficiently tight cement matrix to be selected. The volume share of the cement matrix and aggregate, the cement content, and even the concrete strength are of secondary importance.
- Record ID
- CUT0bd8fcafa4634e958b4ef54a561658fb
- Publication categories
- ;
- Author
- Journal series
- Materials, ISSN , e-ISSN 1996-1944, Biweekly
- Issue year
- 2020
- Vol
- 13
- No
- 20
- Pages
- [1-20]
- Article number
- 4565
- Other elements of collation
- fot.; rys.; tab.; wykr.; Bibliografia (na s.) - 18-20; Bibliografia (liczba pozycji) - 45; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 13, Iss. 20, Spec. Iss.
- Substantive notes
- Special Issue: Durability of Concrete or Mineral-Asphalt Mixtures with Recycled Aggregates
- Keywords in English
- durability, lightweight concrete, lightweight aggregate, sintered fly ash, moisture content, compressive strength, water absorption, water permeability, freeze-thaw resistance, microstructure
- DOI
- DOI:10.3390/ma13204565 Opening in a new tab
- URL
- https://www.mdpi.com/1996-1944/13/20/4565 Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 140
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT0bd8fcafa4634e958b4ef54a561658fb/
- URN
urn:pkr-prod:CUT0bd8fcafa4634e958b4ef54a561658fb
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.